# #/usr/local/bin/python3   指定解释器
# import hashlib            #导入模块
# from sys import argv
# m = hashlib.md5()         #全局变量
# def check_md5(fname):
#     '主程序读，更新，'
#     with open(fname,'rb') as f:
#         while 1:
#             data = f.read(4096)
#             if not data:
#                 break
#             m.update(data)
#     return  m.hexdigest()
# if __name__ == '__main__':
#     result=check_md5(argv[1])  #位置变量
#     print(result)              #结果返还打印
























